Diffusion of innovations: a world tour.
D004059:Diffusion of Innovation; D015658:HIV Infections / Q000517:prevention & control; D006205:Haiti; D006266:Health Education / Q000379:methods*; D006801:Humans; D008302:Mali; D009390:Nepal; D012736:Sex Education; D014802:Vitamin A Deficiency / Q000517:prevention & control